Sound-box attachment for recording horns



Sept. 7, 1926. 1,599,149 B. R.- SEABROOK SOUND BOX ATTACHMENT FOR RECORDING HORNS Fild May 5', 1922 Patented Sept. 7, 1926.

BAes'rE-n moans snnnnoon,

GE IviISHAWAKA, INDIANA.

SOUND-BOX. ATTACHMENT FOR RECOBDING HOBNS.

Application filed l iay 3, 1922. fierial No. 558,048.

My invention relates to improvements in sound box attachment for recordinghorns and it consists more especially oi the teatures pointed out in the annexed cla ms.

The purpose of my invention is to provide means for recording soundswhich are received" by and are delivered from arecording horn; that will enable me to record such sounds more iaith't'ully than has heretofore been possible; that provides. an annular opening around the horn outlet so as to form a communication between the exterior and interior of theconnection between the sound box and the horn betorethe sound waves reach the translating diaphragm; that provides a non-metallic portion in 'the connectingtube leading from the horn to the sound box; and that by reason of the relatedparts enables me to record spoken, musical or other sound waves upon, a suit able master surface in their original purity without making interfering additions thereto or absorbing required values therefrom.

With these and other ends in view, 1' il lustrate in the accompanying drawing such instances of adaptation as will disclose the broad underlying features without limiting myself to the specific details shown thereon or described herein.

Figure 1 is an elevation in section of the several parts, the large end of the horn being shown in broken relation.

Fi n 2 is an elevation in section of a 1nodi-;

fied term of horn end.

' Fig. 8 is an elevation in section on 33 of Fig. 2.

Fig. dis a diagrammatic elevation of a horn in approximate recoroing relation.

line

Fig. 5 is a diagrammatic plan view of Fig. 4. I

Fig. 6 1s a plan view Oi a multi-connecti'on sound box. 7 V

In practically carrying out my invention, I use a recording horn formed of a paperlike support, such as mill board etol, on which is placed a plastic self-setting nonabsorptive and non-responsive composition that is oi the required thickness at the large end and gradually reduces in thickness toward the small end, thus preventing the horn from setting up sympathetic vibrations and on account of the compactness of the composition preventing sound waves being absorbed by the same thereby faithfully delivering the sound waves from the.

horn without having had additions made thereto or substractions taken therefrom.

For recording purposes, horns of the type described in my Patent No. 1,358,883 of Nov. 16,1920 are preferred, or their sub stantial equivalent, in which the wall at the large end is thickest, gradually reducing in thickness toward the small end. Such horns have an outer wall of plastic seltsetting cement-like composition 1 which is placed ev -r a paper-like interior 2. A- the small end this is formed around a conical tube or delivery member 3 that is intorally connected to a supporting flange i and this flange has a tubular extension 5 which terminates in an exteriorly termed cone 6.

The iiange in the form shown in Fig. 1

has radial ears 7 corresponding to bosses 8 toined on the flange or sound responsive connection 9 of the extension or tubular projection 10. Screws 11 hold the partskl and 9 in assembled relation. The tube 10 has a conical portion 12 which joins onto the uniform diameter 13 ot' the tube'lO, near the outer end of the tube 5. Between the conicalend 12 of the tube 10 and the conical exterior 6 of the tube 5 an annular passage 1 lis former. This insures a spaced apart relation between cones 6 and 12 which separates the parts so as to have a layer of air between them.

The tube 10 is further reduced in diame-' '10 and at this point is surrounded by a holding band 26. The other end of the tube 23 has a recess 25 which abuts the conical tube 17-01": the sound box 16, and a holding band 27 is placed around the small end of the tube 28. The internal arrangement of these parts is such that the diameter is gradually reduced from the straight portion of the.

tube 10 to the sound boX 16. In assembling the parts the bands 26 and 27 are slipped over the endsot the rubber tubes 23 and I then the sound box and the tube 10 are inserted in their respective places. The sound box 16rmay be of any d sired type, but I have exemplified a form that is made the 7 subject of a separate application in which a curved diaphragm 18 is placed between suitable rets and the inner box is nned with anon-responsive and nonttace of the sound annular passage 38 which,

absorbent composition 22 similar to the horn body 1. The diaphragm 18 is connected to stylus bar 19 which is pivoted at 20, the outer end having recording stylus 21 attached thereto.

In case it is found desirable to protect the annular opening 1 1 from side drafts indicated by the arrows in F 1, a protecting flange 37 shown in Fig. 2 forms a horizontal if desired, will prevent such side drafts. This'iiange is connected to the radial flange 35 that is a substitute for flange 4 shown in Fig. l. A recess 86 may be formed in flange 35 against which the outer edge 39 of the feet 8 projecting from the flange 9 may have bearing so as to hold the conical portions 6 and 12 in concentric relation.

The horn 1 may be suspended at the large end from ears 29 by means of suspension wires 31, which ears being placed some distance apart to prevent the horn rocking on its axis. The small end may be suspended from eyes 28 sccureo to the flange 4 or 35 as shown in Fig. 3 by means or a suitable suspension 3). The sound box including the suspended horn may be moved lnechanically so that the recording stylus will follow a spiral path on the recording disk by any desired expedient. In Fig. 5, I have diagrammatically instanced a bell crank lever 32 pivoted at 33 and having one leg pivoted to the holding ring 27 and the other leg connected to any desired mechanical movement that is coordinated with the speed of rotation of the recording disk so.

This invention is claimed in its broadest scope to include a recording or transmitting horn having a heavy wall at the receiving end and a gradually reducing thickness thereof toward the other end, such horn cooperating with means for recording sound waves that have been projected into the horn and admitting air between the horn and the sound-responsive device attached thereto.

hat I claim is 1. A sound directing horn, a delivery member for the small end of the horn, a

tubular extension therefrom, a support for a sound responsh'e connection, a projection therefrom having an opening of greater diameter than the tubular extension, and means for holding the parts in concentric spaced-apart relation to each other.

2. In sound directing horns a terminal member for the small end of a horn, comprising a projection to which the horn is secured and a tubular sound delivery e2:- tension communicating with the interior out the horn, and an exterior-1y positioned sound receiving and translating member suitably supported in spaced-apart relation to the latter tube.

In testimony whereof I afiiX my signature.

BAGST'ER ROADS SEABROOK. 

